Reland "[objects.h splitting] Move AsyncGeneratorRequest"

This is a reland of 81756480

Original change's description:
> [objects.h splitting] Move AsyncGeneratorRequest
>
> BUG=v8:5402,v8:8238
>
> Change-Id: I988b1e0b7a958d06690820632bc533d9e5338535
> Reviewed-on: https://chromium-review.googlesource.com/c/1349190
> Reviewed-by: Clemens Hammacher <clemensh@chromium.org>
> Reviewed-by: Tobias Tebbi <tebbi@chromium.org>
> Commit-Queue: Marja Hölttä <marja@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#57776}

TBR=clemensh@chromium.org,ulan@chromium.org

Bug: v8:5402, v8:8238
Change-Id: I9f4b6b761313be586612df7e7753b97f99c4d1e9
Reviewed-on: https://chromium-review.googlesource.com/c/1349283
Commit-Queue: Marja Hölttä <marja@chromium.org>
Reviewed-by: Clemens Hammacher <clemensh@chromium.org>
Reviewed-by: Tobias Tebbi <tebbi@chromium.org>
Cr-Commit-Position: refs/heads/master@{#57786}

src/compiler/code-assembler.h

@@ -30,6 +30,7 @@ namespace internal {
 
 // Forward declarations.
 class AsmWasmData;
+class AsyncGeneratorRequest;
 class CallInterfaceDescriptor;
 class Callable;
 class Factory;

src/heap/setup-heap-internal.cc

@@ -20,6 +20,7 @@
 #include "src/objects/debug-objects.h"
 #include "src/objects/descriptor-array.h"
 #include "src/objects/dictionary.h"
+#include "src/objects/js-generator.h"
 #include "src/objects/js-weak-refs.h"
 #include "src/objects/literal-objects-inl.h"
 #include "src/objects/map.h"

src/objects-inl.h

@@ -532,7 +532,6 @@ StringSet::StringSet(Address ptr) : HashTable<StringSet, StringSetShape>(ptr) {
 // Cast operations
 
 CAST_ACCESSOR(AccessorPair)
-CAST_ACCESSOR(AsyncGeneratorRequest)
 CAST_ACCESSOR(BigInt)
 CAST_ACCESSOR(ObjectBoilerplateDescription)
 CAST_ACCESSOR(Cell)
@@ -1641,12 +1640,6 @@ int HeapObject::SizeFromMap(Map map) const {
       EmbedderDataArray::unchecked_cast(this)->length());
 }
 
-
-ACCESSORS(AsyncGeneratorRequest, next, Object, kNextOffset)
-SMI_ACCESSORS(AsyncGeneratorRequest, resume_mode, kResumeModeOffset)
-ACCESSORS(AsyncGeneratorRequest, value, Object, kValueOffset)
-ACCESSORS(AsyncGeneratorRequest, promise, Object, kPromiseOffset)
-
 ACCESSORS(Tuple2, value1, Object, kValue1Offset)
 ACCESSORS(Tuple2, value2, Object, kValue2Offset)
 ACCESSORS(Tuple3, value3, Object, kValue3Offset)

src/objects.h

@@ -1954,28 +1954,6 @@ class Tuple3 : public Tuple2 {
   DISALLOW_IMPLICIT_CONSTRUCTORS(Tuple3);
 };
 
-class AsyncGeneratorRequest : public Struct {
- public:
-  // Holds an AsyncGeneratorRequest, or Undefined.
-  DECL_ACCESSORS(next, Object)
-  DECL_INT_ACCESSORS(resume_mode)
-  DECL_ACCESSORS(value, Object)
-  DECL_ACCESSORS(promise, Object)
-
-  static const int kNextOffset = Struct::kHeaderSize;
-  static const int kResumeModeOffset = kNextOffset + kPointerSize;
-  static const int kValueOffset = kResumeModeOffset + kPointerSize;
-  static const int kPromiseOffset = kValueOffset + kPointerSize;
-  static const int kSize = kPromiseOffset + kPointerSize;
-
-  DECL_CAST(AsyncGeneratorRequest)
-  DECL_PRINTER(AsyncGeneratorRequest)
-  DECL_VERIFIER(AsyncGeneratorRequest)
-
- private:
-  DISALLOW_IMPLICIT_CONSTRUCTORS(AsyncGeneratorRequest);
-};
-
 // Utility superclass for stack-allocated objects that must be updated
 // on gc.  It provides two ways for the gc to update instances, either
 // iterating or updating after gc.

src/objects/js-generator-inl.h

@@ -19,6 +19,7 @@ namespace internal {
 CAST_ACCESSOR(JSAsyncFunctionObject)
 CAST_ACCESSOR(JSAsyncGeneratorObject)
 CAST_ACCESSOR(JSGeneratorObject)
+CAST_ACCESSOR(AsyncGeneratorRequest)
 
 ACCESSORS(JSGeneratorObject, function, JSFunction, kFunctionOffset)
 ACCESSORS2(JSGeneratorObject, context, Context, kContextOffset)
@@ -29,6 +30,11 @@ SMI_ACCESSORS(JSGeneratorObject, continuation, kContinuationOffset)
 ACCESSORS(JSGeneratorObject, parameters_and_registers, FixedArray,
           kParametersAndRegistersOffset)
 
+ACCESSORS(AsyncGeneratorRequest, next, Object, kNextOffset)
+SMI_ACCESSORS(AsyncGeneratorRequest, resume_mode, kResumeModeOffset)
+ACCESSORS(AsyncGeneratorRequest, value, Object, kValueOffset)
+ACCESSORS(AsyncGeneratorRequest, promise, Object, kPromiseOffset)
+
 bool JSGeneratorObject::is_suspended() const {
   DCHECK_LT(kGeneratorExecuting, 0);
   DCHECK_LT(kGeneratorClosed, 0);

src/objects/js-generator.h

@@ -140,6 +140,28 @@ class JSAsyncGeneratorObject : public JSGeneratorObject {
   DISALLOW_IMPLICIT_CONSTRUCTORS(JSAsyncGeneratorObject);
 };
 
+class AsyncGeneratorRequest : public Struct {
+ public:
+  // Holds an AsyncGeneratorRequest, or Undefined.
+  DECL_ACCESSORS(next, Object)
+  DECL_INT_ACCESSORS(resume_mode)
+  DECL_ACCESSORS(value, Object)
+  DECL_ACCESSORS(promise, Object)
+
+  static const int kNextOffset = Struct::kHeaderSize;
+  static const int kResumeModeOffset = kNextOffset + kPointerSize;
+  static const int kValueOffset = kResumeModeOffset + kPointerSize;
+  static const int kPromiseOffset = kValueOffset + kPointerSize;
+  static const int kSize = kPromiseOffset + kPointerSize;
+
+  DECL_CAST(AsyncGeneratorRequest)
+  DECL_PRINTER(AsyncGeneratorRequest)
+  DECL_VERIFIER(AsyncGeneratorRequest)
+
+ private:
+  DISALLOW_IMPLICIT_CONSTRUCTORS(AsyncGeneratorRequest);
+};
+
 }  // namespace internal
 }  // namespace v8